Office 365 (Outlook 2013 / 2016 /2019 for Win) - How to View Subfolders Within a Folder
If you are having trouble finding your folders in Outlook, here is a tip to help you expand your folders to find the sub-folder/s within.
Click the hollow triangle to the left of the folder to expand it and the sub-folders will appear. When the triangle is solid black, it means that the folder has been expanded.
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